Substation Design MCQs (Part-11)

What is the primary function of a transmission substation?

A To step up voltage for long-distance transmission
B To step down voltage for local distribution
C To store energy for peak demand
D To improve power factor

What is the typical purpose of a distribution substation?

A To transmit electricity across regions
B To step down voltage for residential and commercial use
C To regulate frequency
D To increase fault currents

Which substation component protects equipment from voltage surges caused by lightning?

A Circuit breaker
B Lightning arrester
C Transformer
D Capacitor bank

What is the purpose of substation maintenance?

A To store reactive power
B To ensure reliable operation and prevent equipment failure
C To reduce voltage levels
D To disconnect faulty circuits

What does “fault isolation” mean in a substation?

A Disconnecting faulted sections while maintaining power supply to healthy areas
B Disconnecting the entire system during a fault
C Increasing voltage levels during a fault
D Reducing reactive power during a fault

What is a sectionalized busbar system?

A A busbar that operates at high voltage
B A busbar divided into sections for reliability and flexibility
C A busbar designed for renewable energy substations
D A busbar with automatic grounding systems

What is the role of a relay in a substation?

A To regulate voltage levels
B To detect faults and signal circuit breakers
C To measure reactive power
D To step up current flow

What is the function of a capacitor bank in a substation?

A To step down voltage levels
B To provide reactive power and improve power factor
C To measure current flow
D To isolate faults

What is the purpose of routine maintenance in a substation?

A To step up voltage levels
B To prevent equipment failures and ensure smooth operation
C To monitor power flow
D To reduce insulation strength

What is the role of tap changers in transformers?

A To adjust transformer winding to regulate voltage
B To store electrical energy
C To step down current flow
D To provide reactive power

What is a dielectric strength test used for in substations?

A To measure current flow
B To determine the insulation’s ability to withstand high voltages
C To regulate voltage levels
D To improve power factor

What is the purpose of substation fault isolation?

A To disconnect faulty sections while maintaining power to healthy parts of the system
B To disconnect the entire system during a fault
C To increase power factor
D To store electrical energy

What is a power transformer used for in a transmission substation?

A To step up voltage levels for long-distance transmission
B To store electrical energy
C To measure power flow
D To isolate faulty sections

What is the main advantage of sectionalized busbars in substations?

A They reduce power losses significantly
B They allow parts of the busbar to operate independently, improving reliability
C They integrate renewable energy sources directly
D They eliminate the need for circuit breakers

What is the typical voltage range for high-voltage substations?

A Below 33 kV
B 110 kV to 765 kV
C 11 kV to 33 kV
D Above 1000 kV

What is the purpose of a high-voltage circuit breaker?

A To step up voltage levels
B To interrupt large fault currents
C To measure power flow
D To provide reactive power

What is the main advantage of compact substations?

A Lower cost
B Smaller size and suitability for urban areas
C Higher voltage handling capacity
D Easier maintenance

What is the function of a tap changer in transformers?

A To adjust transformer winding to regulate voltage
B To store electrical energy
C To step down current flow
D To provide reactive power

What is the typical voltage range for high-voltage substations?

A Below 33 kV
B 110 kV to 765 kV
C 11 kV to 33 kV
D Above 1000 kV

What is the role of an isolator in a substation?

A To interrupt fault currents
B To disconnect equipment for maintenance under no-load conditions
C To regulate voltage
D To store electrical energy